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[S390] dasd: fix online/offline race

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Setting a DASD online and offline in quick succession may cause
a kernel panic or let the chhccwdev command wait forever.
The Online process is split into two parts. After the first part
is finished the offline process may be called. This may result
in a situation where the second online processing part tries to
set the DASD offline as well.
Use a mutex to protect online and offline against each other.
Also correct some checking.

Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Stefan Haberland
2010-02-26 22:37:46 +01:00
committed by Martin Schwidefsky
parent 22e0a04672
commit 9eb251225a
3 changed files with 16 additions and 8 deletions
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drivers/s390/block/dasd_genhd.c
+1
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@@ -88,6 +88,7 @@ void dasd_gendisk_free(struct dasd_block *block)
if (block->gdp) {
del_gendisk(block->gdp);
block->gdp->queue = NULL;
block->gdp->private_data = NULL;
put_disk(block->gdp);
block->gdp = NULL;
}